US 11,943,629 B2
Method and apparatus for transmitting LTE waveforms in shared spectrum by carrier sensing
Ralf Matthias Bendlin, Plano, TX (US); Anthony Edet Ekpenyong, Houston, TX (US); Pierre Bertrand, Antibes (FR); and Brian F. Johnson, Kensington, MD (US)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by Texas Instruments Incorporated, Dallas, TX (US)
Filed on Jun. 24, 2019, as Appl. No. 16/449,939.
Application 16/449,939 is a continuation of application No. 15/888,928, filed on Feb. 5, 2018, granted, now 10,334,450.
Application 15/888,928 is a continuation of application No. 15/227,406, filed on Aug. 3, 2016, granted, now 9,888,389.
Application 15/227,406 is a continuation of application No. 14/718,593, filed on May 21, 2015, granted, now 9,532,230, issued on Dec. 27, 2016.
Claims priority of provisional application 62/008,032, filed on Jun. 5, 2014.
Prior Publication US 2019/0313259 A1, Oct. 10, 2019
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 16/14 (2009.01); H04W 72/21 (2023.01); H04W 72/541 (2023.01); H04W 74/0816 (2024.01); H04W 36/00 (2009.01)
CPC H04W 16/14 (2013.01) [H04W 72/21 (2023.01); H04W 72/541 (2023.01); H04W 74/0816 (2013.01); H04W 36/0069 (2018.08)] 12 Claims
OG exemplary drawing
 
1. A method, comprising:
connecting, by a user equipment (UE), to a primary serving cell (PCell) operating on a licensed frequency spectrum;
connecting, by the UE, to a secondary serving cell (SCell) operating on an unlicensed frequency spectrum;
receiving, by the UE, a discovery signal on the SCell;
receiving, by the UE, a channel state information reference signal (CSI-RS) on the SCell during discovery signal occasions;
monitoring, by the UE, the SCell to determine an idle status of the SCell;
transmitting data on the SCell based on the idle status of the SCell; and
dropping a configured sounding reference signal (SRS) transmission based on a carrier sense multiple access with collision avoidance (CSMA/CA) function.